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  <a name="ZH-CN_TOPIC_0000001792395516"></a><a name="ZH-CN_TOPIC_0000001792395516"></a>
  <h1 class="topictitle1">周期性执行备份</h1>
  <div>
   <p>将需要保护的项目/资源集或弹性云服务器关联到指定SLA，系统将按照SLA的定义周期性执行备份。</p>
   <div class="section" id="ZH-CN_TOPIC_0000001792395516__section592472483112">
    <h4 class="sectiontitle">注意事项</h4>
    <ul id="ZH-CN_TOPIC_0000001792395516__ul11489174014141">
     <li id="ZH-CN_TOPIC_0000001792395516__li15489104013147">请确保生产存储已预留用于备份的快照空间，快照预留空间=源LUN数据量*备份周期内数据变化量百分比。默认情况下，建议预留源LUN容量的20%用于创建快照。</li>
     <li id="ZH-CN_TOPIC_0000001792395516__li753614613148">弹性云服务器处于以下状态时支持备份：“运行中 ”、“正在开机”、“正在关机 ”、“关机”、“重装操作系统中”、“重装操作系统失败”、“切换操作系统中”、“切换操作系统失败”。</li>
     <li id="ZH-CN_TOPIC_0000001792395516__li3646173183411">备份时，每个ProtectAgent的并发任务数默认为20，不建议修改此并发数，否则可能出现扫盘失败进而导致备份失败的问题。</li>
     <li id="ZH-CN_TOPIC_0000001792395516__li1469271831514">如果华为分布式块存储上的弹性云服务器/云硬盘迁移到了SAN存储，执行弹性云服务器/云硬盘备份前，需要先将SAN存储资源添加到<span id="ZH-CN_TOPIC_0000001792395516__text62648572215">本产品</span>中。</li>
     <li id="ZH-CN_TOPIC_0000001792395516__li999215138588">首次备份前，请先完成资源扫描，以便系统显示最新的弹性云服务器信息，具体操作请参见《ProtectAgent安装指南》中的“管理代理主机”章节。</li>
     <li id="ZH-CN_TOPIC_0000001792395516__li412153019411">如果备份任务异常，导致快照删除失败，当下一次执行全量备份任务时，系统会自动删除无用的快照。</li>
    </ul>
   </div>
   <div class="section">
    <h4 class="sectiontitle">周期性备份项目/资源集</h4>
    <ol>
     <li><span>选择<span class="uicontrol" id="ZH-CN_TOPIC_0000001792395516__zh-cn_topic_0000001839194633_zh-cn_topic_0000001839142377_uicontrol23517341412">“<span id="ZH-CN_TOPIC_0000001792395516__zh-cn_topic_0000001839194633_zh-cn_topic_0000001839142377_text635183444114">保护</span> &gt; 云平台 &gt; 华为云Stack”</span>。</span></li>
     <li><span>选择“<span>项目/资源集</span>”页签，选择需要保护的项目/资源集。</span><p></p>
      <div class="note">
       <img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span>
       <div class="notebody">
        <p>如果系统未显示需要保护的项目/资源集，请先单击界面左侧区域的<span class="uicontrol">“<span>更多</span> &gt; <span>资源扫描</span>”</span>，更新资源信息。</p>
       </div>
      </div> <p></p></li>
     <li><span>单击列表上方的<span class="uicontrol">“<span>保护</span>”</span>。</span><p></p>
      <div class="note">
       <img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span>
       <div class="notebody">
        <ul>
         <li>系统将备份该项目/资源集下的所有弹性云服务器。</li>
         <li>您也可以在需要保护的项目/资源集所在行，单击<span class="uicontrol">“<span>更多</span> &gt; <span>保护</span> ”</span>。</li>
        </ul>
       </div>
      </div> <p></p></li>
     <li id="ZH-CN_TOPIC_0000001792395516__li343674154015"><span>选择系统预置或用户自行创建的SLA。</span><p></p><p id="ZH-CN_TOPIC_0000001792395516__p33248794210">您也可以单击<span class="uicontrol" id="ZH-CN_TOPIC_0000001792395516__uicontrol744210206420">“<span id="ZH-CN_TOPIC_0000001792395516__text1873812341015">创建</span>”</span>，创建新的SLA。</p> <p></p></li>
     <li id="ZH-CN_TOPIC_0000001792395516__li1316316472413"><span>选择代理主机。如不选择代理主机，执行任务时系统将随机选择一个代理主机。</span></li>
     <li><span>设置以下参数。</span><p></p>
      <ol type="a">
       <li>选择是否覆盖弹性云服务器已有的SLA。
        <div class="p">
         默认为<span class="uicontrol" style="color:#282B33;">“<span>不覆盖云服务器已有的SLA</span>”</span><span style="color:#282B33;">。</span>
         <div class="note">
          <img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span>
          <div class="notebody">
           <p>后续修改项目/资源集关联的SLA时，修改时选择<span class="uicontrol" style="color:#282B33;">“<span>不覆盖云服务器已有的SLA</span>”</span>，如果弹性云服务器的SLA与项目/资源集本身的SLA一致，则弹性云服务器的SLA会被覆盖。</p>
          </div>
         </div>
        </div></li>
       <li>选择SLA应用策略，支持同时选择以下一个或多个选项：
        <ul>
         <li><span>将项目/资源集SLA应用到所有未关联的云服务器上</span></li>
         <li><span>将项目/资源集SLA应用到新创建的云服务器上</span><p>扫描华为云Stack后，新发现的弹性云服务器关联与项目/资源集相同的SLA。</p></li>
        </ul></li>
       <li>指定保护计划中要排除或包含的弹性云服务器。<p>您可以通过弹性云服务器名称指定排除或包含部分弹性云服务器。</p> <p>支持精确匹配和模糊匹配弹性云服务器名称，模糊匹配规则包括：前缀匹配（如abc*）、后缀匹配（如*abc）、中间匹配（如*abc*）。</p></li>
      </ol> <p></p></li>
     <li><span>单击<span class="uicontrol" id="ZH-CN_TOPIC_0000001792395516__zh-cn_topic_0000001607841256_uicontrol471113581111">“确定”</span>。</span><p></p><p id="ZH-CN_TOPIC_0000001792395516__zh-cn_topic_0000001607841256_p25041111535">如果当前系统时间已晚于该SLA首次备份的开始时间，则关联备份SLA后可以选择在当前立即执行备份或者根据SLA中设置的备份策略等待下次调度。</p> <p></p></li>
    </ol>
   </div>
   <div class="section">
    <h4 class="sectiontitle">周期性备份弹性云服务器</h4>
    <ol>
     <li><span>选择<span class="uicontrol" id="ZH-CN_TOPIC_0000001792395516__zh-cn_topic_0000001839194633_zh-cn_topic_0000001839142377_uicontrol23517341412_1">“<span id="ZH-CN_TOPIC_0000001792395516__zh-cn_topic_0000001839194633_zh-cn_topic_0000001839142377_text635183444114_1">保护</span> &gt; 云平台 &gt; 华为云Stack”</span>。</span></li>
     <li><span>选择“<span>云服务器</span>”页签，选择需要保护的弹性云服务器。</span><p></p>
      <div class="note">
       <img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span>
       <div class="notebody">
        <p>如果系统未显示需要保护的弹性云服务器，请先单击界面左侧区域的<span class="uicontrol">“<span>更多</span> &gt; <span>资源扫描</span>”</span>，更新资源信息。</p>
       </div>
      </div> <p></p></li>
     <li><span>单击列表上方的<span class="uicontrol">“<span>保护</span>”</span>。</span><p></p>
      <div class="note">
       <img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span>
       <div class="notebody">
        <p>您也可以在需要保护的弹性云服务器所在行，单击<span class="uicontrol">“<span>更多</span> &gt; <span>保护</span> ”</span>。</p>
       </div>
      </div> <p></p></li>
     <li><span>选择备份的云硬盘。</span><p></p><p>系统默认开启“<span>自动保护云硬盘</span>”，备份弹性云服务器下的所有云硬盘。您可以关闭“<span>自动保护云硬盘</span>”，单击“<span>请选择</span>”手动选择部分云硬盘备份。</p>
      <div class="note">
       <img src="public_sys-resources/note_3.0-zh-cn.png"><span class="notetitle"> </span>
       <div class="notebody">
        <p>选择部分云硬盘进行备份后，生成的副本仅支持云硬盘级的恢复，不支持弹性云服务器级恢复。</p>
       </div>
      </div> <p></p></li>
     <li><span>选择系统预置或用户自行创建的SLA。</span><p></p><p id="ZH-CN_TOPIC_0000001792395516__zh-cn_topic_0000001792395516_p33248794210">您也可以单击<span class="uicontrol" id="ZH-CN_TOPIC_0000001792395516__zh-cn_topic_0000001792395516_uicontrol744210206420">“<span id="ZH-CN_TOPIC_0000001792395516__zh-cn_topic_0000001792395516_text1873812341015">创建</span>”</span>，创建新的SLA。</p> <p></p></li>
     <li><span>选择代理主机。如不选择代理主机，执行任务时系统将随机选择一个代理主机。</span></li>
     <li><span>单击<span class="uicontrol" id="ZH-CN_TOPIC_0000001792395516__zh-cn_topic_0000001607841256_uicontrol471113581111_1">“确定”</span>。</span><p></p><p id="ZH-CN_TOPIC_0000001792395516__zh-cn_topic_0000001607841256_p25041111535_1">如果当前系统时间已晚于该SLA首次备份的开始时间，则关联备份SLA后可以选择在当前立即执行备份或者根据SLA中设置的备份策略等待下次调度。</p> <p></p></li>
    </ol>
   </div>
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     <strong>父主题：</strong> <a href="zh-cn_topic_0000001839274597.html">步骤7：执行备份</a>
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